t r i q u i n t s e m i c o n d u c t o r , i n c . 1 preliminary data sheet the TQ8318/tq8319 is a low jitter, high performance electro-optic driver intended for directly interfacing cml outputs from a multiplexer or clock recovery device to various eo devices, including cooled and uncooled dfb and fp lasers, high power vcsel arrays, ea modulators and differential mach- zehnder (mz) modulators. the TQ8318 and the triquint tga1328/8652 can be used in combination for single ended 9v mz drive applications. the TQ8318/19 s symmetry and level controls, low additive jitter, and excellent rise/fall times while driving significant loads allow the highest system level performance at low cost. the devices also include an offset control to allow adjustment of dc bias between 0v and -1v for eam/eml, or 0-40ma for laser threshold, applications. the 28 pin tssop footprint and low jitter makes the devices particularly suitable for high port count wdm circuit packs and modules, and for optical modules. these devices are compatible with cmos, sige or gaas muxes with cml, elvds, or lvpecl outputs. TQ8318/19 vsymx vlevel gnd n.c. n.c. gnd din ndin gnd vtt vdd gnd vsen10 vsen1 vee vee gnd bias drivegnd drivegnd ndout dout drivegnd drivegnd vee vee n.c. gnd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 * downset paddle is gnd * 50 ? 5 ? 50 ? 50 ? vee 50 ? 50 ? vee oc192/stm64 e/o driver features high performance fully back- terminated 20ma/1v to 60ma/ 3v modulation output driver (TQ8318) also available without back- terminations for 25 ohm, 40 ma to 120ma applications (tq8319) output can drive direct coupled electro-absorptive modulator (eam/eml), or ac coupled differential mach-zehnder modulator or direct modulated laser (dml) nrz data rates to 10.8gbs output symmetry adjust 0 to 1.0v output offset control 32ps max output risetime +3.3v cml direct coupled input can be ac coupled for elvds and lvpecl inputs 28 pin tssop small outline package or die 0 c to +110 c case operating temperature range applications dml with drive to 120ma single-ended 50 ohm 1.0-3.0v eam/eml driver (dc coupled with integral 0 to -1v offset) 6v differential 50 ohm mach- zehnder driver (ac coupled)
2 TQ8318/tq8319 preliminary data sheet 10.8gb/s output driver these devices are extremely well suited to driving a variety of electro-optical devices that utilize a grounded case. a +3.3v/-5v family of devices is available for applications where the driven device does not utilize a grounded case or where these drivers are used in die form. the TQ8318 s 50 ohm back-terminated high power cascoded output stage drives between 1.0v and 3.0v of modulation into a single ended 50 ohm external load (6.0v peak-peak in differential mode), or between 20ma and 60ma for dml applications. a variant without the back-terminations, the tq8319, may be used in 25 ohm external load applications to modulate up to 120 ma. the separate power supply pins for the output stage are drivegnd = 0v and vee = -7.5v. note that outputs may be driven as differential or single ended signals at dout and ndout and that a cml drive level is possible by adjusting the output level control to an appropriate level. unused output complements must be tied as 50 ohm (TQ8318, 25 ohm for tq8319) to gnd when direct coupling is used. the data amplitude may be adjusted using vlevel and the crossing level of the output data eye can be adjusted using vsymx. both of these levels are preset internally if vlevel and vsymx are left open (n.c.). the dc offset, on dout and ndout may be biased to a dc level with a voltage control on bias from 0v/0ma to -1.0v/40ma (25 ohms). the output current level and voltage amplitude at dout and ndout may be set using an external feedback control loop. to set the output current level, connect an external current source, isource, equal to 20% of the desired output, to vsen10. connect vlevel, vsen10 and vsen1 to an amplifier, as shown in figure 1, with a minimum input common mode range of (isource*50 ohm ) above vee. the choice of the external current source also sets the output voltage swing. for example, to achieve the maximum swing of 3.0v into 25 ohm (50 ohm internal back-terminated impedance in parallel with a 50 ohm forward load) , a 12ma source must be used (isource*10*25 ohm = 120ma*25 ohm = 3.0v). note that feedback with a back facet monitor or pin diode provides a more ideal method to control optical output power and extinction ratio, if available. figure 1 depicts a dml application, though similar considerations can be made for either eam/eml or differential mzm applications. 25 ohm typ figure1. level control circuit 50 ohm grounded case bias 4ma - 12ma 5 ? 50 ? 50 ? 50 ? pre amp vsen1 vsen10 vlevel isource ndout dout drivegnd vee -7.5v dml
TQ8318/tq8319 3 sonet/sdh/atm products preliminary data sheet telecom products table 1. TQ8318/19 pin descriptions signal type pin number description din cml input 7 serial data input. internally terminated by 50 ohms to vtt ndin cml input 8 complement of din. internally terminated by 50 ohms to vtt dout high drive output 21 high power differential driver modulated output. ndout high drive output 22 complement of dout. if unused must be terminated in the same manner as dout. vsymx analog input 1 rise/fall time symmetry adjust control signal input. input impedance is typically 10k ohm. vlevel analog input 2 output data amplitude adjust control signal input. input impedance is typically 10k ohm. vsen10 analog i/o 13 output current level reference pin. when driven with an external current source at exactly 1/5 the output current of the TQ8318 (1/10 for the tq8319) level, the voltage at vsen10 is equal to that at vsen1. can be used to implement a control loop. vsen1 analog output 14 output current level sensing pin. vsen1 voltage is directly proportional to the output current level. connects internally to 5 ohm resistor in differential driver current tail. bias analog input 25 output offset control input power pins signal description pin number vtt input termination supply 10 vdd pre-drive and i/o vdd supply 11 gnd ground supply 3, 6, 9, 12, 26, 15, package down paddle (required) vee output stage neg. supply (-7.5v) 28, 27, 18, 17 drivegnd output stage pos. supply (0v) 24, 23, 20, 19 (note: these pins are unused in the tq8319) nc do not connect 4, 5, 16
4 TQ8318/tq8319 preliminary data sheet signal symbol parameter min typ max units vdd vdd supply voltage range 3.14 3.3 3.47 v idd supply current (note 2) 55 ma vtt vtt input termination supply voltage range vdd v vee vee negative driver supply -7.13 -7.5 -7.87 v iee supply current (notes 3 and 5) 260 ma drivegndv drive output stage power supply 0 v i drive TQ8318 supply current for output stage (50 ohm load) 20 60 ma i drive tq8319 supply current for output stage (25 ohm load) 40 120 ma t c case temperature measured at the case paddle 0 110 o c p diss power dissipation (note 4) 2.45 3.37 w p diss power dissipation (note 5) 2.13 2.67 w notes: 1. room temperature condition 2. vdd at operating range. 3. vdd , vee , and vtt at operating range. 4. idrive into specified load and max modulation and 1v offset. 5. idrive into specified load and max modulation and 0v offset. table 3. operating ranges table 2. absolute maximum ratings parameter symbol min max units supply voltage vdd gnd-0.5 4.0 v output stage supply return vee -8 gnd+0.5 v cml inputs gnd-0.5 vdd+0.5 v control signals vee-0.5 gnd+0.5 v tstg, storage temperature -55 150 o c tc, maximum case operating temperature 110 o c tj, maximum junction temperature 150 o c electrostatic discharge (100pf, 1.5k ? ) 1000 v notes: 1. all voltages with respect to gnd. table 4. dc characteristics differential cml input symbol parameter min nom max unit v icom input common mode voltage range vdd-0.4 vdd-0.150 v v idiff input differential voltage, per side, pk-pk 300 800 mv r in input termination resistance 50 ohm c in input capacitance tbd pf v esd esd breakdown rating 1000 v notes 1. for +3.3v cml operation inputs may be direct coupled. to interface lvpecl or to elvds, ac coupling is recommended. an internal bias voltage is generated on-chip so vtt may be left open.
TQ8318/tq8319 5 sonet/sdh/atm products preliminary data sheet telecom products signal symbol description min typ max units dout tpw output data pulse width 95 100 105 % ndout t rise output data rise time 1 6 2 5 3 2 p s (note 2) tfall output data f all time 1 6 2 5 3 2 p s jpp output data peak-peak jitter (note 3) 3 5 ps v mean_max output data mean pk-pk for high output applications; 3.0 v vlevel =(vee+2.1)v, vdrive = 0 v, vee= -7.5v v mean_min output data mean pk-pk for low output applications; 1.0 v vlevel = (vee+0.8)v, vdrive = 0 v, vee= -7.5v x ingmin min. data crossing lvl. adjustment range with vsymx 20 - 40 % x ingmax max. data crossing lvl adjustment range with vsymx 60 - 80 % dxing absolute variation in output data crossing level over full -5 - +5 % vlevel operating range %over overshoot - - 10 % %under undershoot - - 10 % %ripple ripple - - 10 % rate nrz data rate (note 5) tbd 10800 mbs v offset offset voltage referred to drivegnd (note 6) -1.0 tbd v t skew dout to ndout magnitude measured at common mode 6 ps table 6. 10.8 gb/s high speed output signal specifications table 5. control signal specifications signal symbol parameter min typ max units vsymx v def default input level 0.73 vee v v symx vsymx nominal operating range v def -0.18 v def +0.18 v z symx vsymx input impedance 10 k ohm vlevel v def default input level 0.83 vee v v level vlevel nominal operating range vee+0.8 vee+2.1 v a amp output data amplitude adjust gain 1.54 v/v z level vlevel input impedance 10 k ohm vsen1 v sen1 output current sensing voltage level for TQ8318 vee+(2.5 i drive )v output current sensing voltage level for tq8319 vee+(5 i drive )v z sen1 vsen1 equivalent resistance 5 ohm vsen10 v sen10 control current input voltage level vee+(50 i drive )/5 v z sen10 vsen10 equivalent resistance 50 ohm i sen10 vsen10 input current range 4 12 ma v senrat vsen10 to vsen1 ratio 9.9 10 10.1 % bias nominal output offset control range vee vee+1.65 v v def default input level vee v notes: 1. refer to figure 2. all specifications for output data apply under the following conditions: output data pattern: 2 23 -1 prbs, 9.95328gbit/s dout and ndout termination: direct coupled external load is a 50 ohm termination to gnd for the TQ8318; direct coupled external load is a 25 ohm termination to gnd for the tq8319
6 TQ8318/tq8319 preliminary data sheet notes: 1. refer to figure 2. all specifications for output data apply under the following conditions: output data pattern: 2 23 -1 prbs, 9.95328gbit/s dout and ndout termination: direct coupled external load is a 50 ohm termination to gnd for the TQ8318; direct coupled external load is a 25 ohm termination to gnd for the tq8319 termination network return loss: >20 db, 0 to 4 ghz (TQ8318 only) >15 db, 4 to 12 ghz >6 db, 12 to 20 ghz vlevel: over specified operating range vsymx: adjusted to give 50% data crossing 2. this specification applies to the vmean measurement shown in figure 2. vlevel must be adjusted to the specified level and vsymx must be adjusted for optimum eye crossing level before making data eye measurements. maximum rise and fall times are measured with a 35ps input rise and fall time. 3. measured at 2 23 -1 prbs, 9.95328 gbit/s, eye crossings 4. peak to peak jitter is defined as the difference between the measured jitter on the device and the test system jitter. jitter is unfiltered broadband measurement. 5. device will function down to dc however some specs in table 6 may not be met. 6. v mean full spec range is supported over v offset range. mean 1 level t rise , t fall mean 0 level v ripple j pp t pw v over v under 100% 80% 20% 0% data crossing meas. t rise , t fall v ripple j pp v mean v min v max figure 2. 10.8gb/s output data eye diagram t pw = half of input waveform period v max = maximum peak-to-peak voltage v min = minimum peak-to-peak voltage (eye interior) v mean = mean peak-to-peak voltage (mean eye opening) t rise = 20% to 80% rise time, mean 0 to mean 1 t fall = 20% to 80% fall time, mean 0 to mean 1 % over = vover/vmean x 100% % under = vunder/vmean x 100% % ripple = vripple/vmean x 100% j pp = peak-to-peak data crossing jitter note: mimimum display persistence of 2s is assumed for the above measurements. v offset drivegnd
TQ8318/tq8319 7 sonet/sdh/atm products preliminary data sheet telecom products figure 3. tek tds8000 oscilloscope to cables to 12.5 gbs hp bert running at 10.7 gb/s figure 4. TQ8318 (in tssop) tested with instruments and cables from figure 3 vert: 100mv/div horiz: 15ps/div rise: 18.30ps fall: 20.40ps jitter: 10.20ps p-p vert: 500 mv/div horiz: 15 ps/div rise: 22.80 ps fall: 18.60 ps jitter: 14.10 ps p-p
8 TQ8318/tq8319 preliminary data sheet side view end view top view section "b-b" detail 'a' b b exposed pad view min nom max a a1 a2 b b1 c c1 d e1 e e l n p p1 1.1262 .0254 .1500 .8500 1.0500 .1900 .3000 .1900 .2500 .0900 .2000 .0900 .1600 9.6000 9.8000 4.3000 4.4000 4.5000 .6500 .6500 .6500 6.4000 .5000 .6000 .7000 28 5.5000 3.0000 3.0100 note: all dimensions in millimeters (mm). d a e c a 1 1.00 dia. a 2 seating plane 1 2 3 see detail "a" 1.00 1.00 aaa c l b1 (b) (c) c1 with plating base metal e1 e e/2 c b ( ) (view rotated 90 c.w.) 0.25 l p1 p (14 ) (14 ) (1.00) c o figure 6. tssop-28 downpaddle package mechanical drawing figure 5. typical output at 12.5 gb/s for TQ8318 tssop o o o 5.0000
TQ8318/tq8319 9 sonet/sdh/atm products preliminary data sheet telecom products ordering information TQ8318 10.7 gb/s backterminated eo driver +3.3/-7.5v tssop package tq8319 10.7 gb/s unterminated eo driver +3.3/-7.5v tssop package TQ8318-dd dc tested TQ8318 die TQ8318-da ac tested TQ8318 die tq8319-dd dc tested tq8319 die tq8319-da ac tested tq8319 die related components: tq8317 10.7 gb/s backterminated eo driver +3.3/-5v tssop package tq8320 10.7 gb/s unterminated eo driver +3.3/-5v tssop package tga1328 single ended 9v driver - die form tga8652 single ended 9v driver - packaged form additional information for latest specifications, additional product information, worldwide sales and distribution locations, and information about triquint: web: www.triquint.com tel: (503) 615-9000 (oregon, usa) email: sales@tqs.com fax: (503) 615-8900 (oregon, usa) for technical questions and additional information on specific applications: email: applications@tqs.com the information provided herein is believed to be reliable; triquint assumes no liability for inaccuracies or omissions. triqui nt assumes no responsibility for the use of this information, and all such information shall be entirely at the user's own risk. prices an d specifications are subject to change without notice. no patent rights or licenses to any of the circuits described herein are implied or grant ed to any third party. triquint does not authorize or warrant any triquint product for use in life-support devices and/or systems. copyright ? 2001 triquint semiconductor, inc. all rights reserved. revision 0.0.a august 2001 approximate actual size of package footprint
10 TQ8318/tq8319 preliminary data sheet known device issues as of august 1, 2001 1. there is a 20ghz oscillation that is bias space related. the oscillation is a free-running sine wave at approximately 20ghz. no oscillations have been observed if vbias is left at default (vbias = vee). the oscillations have been observed to occur when voffset is between -0.5v and -1.0v and voutpp is less than 2.5v. 2. vbias does not conform to the operation range shown in table 1 absolute maximum ratings . the bias pin is directly connected to the gate of the fet in the bias current generator. as such, voltages in excess of vee+2.5v may cause damage to the bias generator. placing a 2.5k ohm resistor in series with the vbias pin will prevent damage to the part. 3. the average measured full output voltage offset is -950mv.
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